Campbell John McGrath (born January 26, 1962) is an American poet. He is the author of twelve full-length collections of poetry, including Seven Notebooks (Ecco Press, 2008), Shannon: A Poem of the Lewis and Clark Expedition (Ecco Press, 2009), In the Kingdom of the Sea Monkeys (Ecco Press, 2012), and XX: Poems for the Twentieth Century (Ecco Press, 2016), for which McGrath was a finalist for the Pulitzer Prize in Poetry.